KT150s in a Preamp Design?


I'm a bit of a shade tree tube amp mechanic;  I'm no expert and have a decent but not comprehensive knowledge of design.  Can someone tell me what's going on with this tube preamplifier design?  I've never seen KT150s in a preamplifier!

http://www.thebestamp.com/Tube_Pre-Amps/Reference_Series/Reference-3.php

Calling Atmasphere!  
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Hey I'm interested, and more so if you actually try it and compare KT150s to 6SN7s in a preamp.  I run four 6SN7s in my preamp and four KT150s in my mono amps. 

Have wondered who's actually tapped the real potential and ceiling limit of a KT150 tube in different ways. Let us know if you do.   
I believe you can use EL32 tubes in that particular preamp as well as kt150.
I been looking at their tube EQ for a while. I like tone control and that EQ with a balanced passive pre, Tape and LP playback heaven. I like the options too. It has a bypass and can loop right in with phono/tape preamp.

Gives a balanced option for a Reel to Reel,  XLR to record..

4-6k for a Manley.

These guys Under 2k, I just wonder about crosstalk? Balanced though.

They have good reviews on their passive with remote too..

What's their lead times? Anyone know?

I like um...

Regards